Single crystals of Diaqua Bisglycine Cobaltous Chloride (DBGCoCl) have been synthesized and growth slow evaporation method. Grown crystals were subjected to FTIR and XRD studies for structural confirmation. The DBGCoCl crystallizes in the monoclinic system with the space group P2(1)/c. The UV-vis specific for the pure glycine as well the cobalt chelated glycine have been recorded. The lower cutoff wavelet observed from the UV-vis spectrum is found to decrease by the chelation of cobalt with glycine and leads to an increase in the band gap of the compound from 3.13 eV to 4.91 eV. The optical constants calculated and illustrated graphically. Mechanical hardness of the grown crystal DBGCoCl was studied and Vickers hardness number was calculated. The work hardening coefficient (n) was determined to be 1.365 and the stiffness constants for different loads were calculated and reported. The thermal stab of the grown crystal has been studied using TGA and DTA. The crystal is thermally stable up to 116.8 (C) 2009 Elsevier B.V. All rights reserved.